1. Pypy
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Antonio Cuni  committed 1c01416 Merge

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File pypy/doc/project-ideas.rst

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 PyPy's bytearray type is very inefficient. It would be an interesting
 task to look into possible optimizations on this.
 
+Implement copy-on-write list slicing
+------------------------------------
+
+The idea is to have a special implementation of list objects which is used
+when doing ``myslice = mylist[a:b]``: the new list is not constructed
+immediately, but only when (and if) ``myslice`` or ``mylist`` are mutated.
+
+
 Numpy improvements
 ------------------